Intake Manifold Pressure Control for Low-Voltage Engine Restart
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Solution Overview
Problem
Existing vehicles face challenges in appropriately restarting the engine during idle reduction control due to low battery voltage, which can lead to insufficient torque from the starter motor to overcome engine friction and rotational resistance.
Innovation Solution
The vehicle is equipped with a control apparatus that adjusts the internal pressure of the intake manifold based on battery voltage, using processors to control devices like the throttle valve and suction device to ensure adequate pressure for engine startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If idle reduction control is implemented to reduce exhaust gas and improve fuel consumption, then environmental performance and fuel efficiency are improved, but engine restart reliability deteriorates due to low battery voltage
Solution Approach 1:
The control apparatus performs preliminary action by adjusting the intake manifold pressure to a lower level before engine restart is attempted. This anticipates the low battery voltage condition and compensates in advance by reducing compression work requirements, ensuring the starter motor can successfully crank the engine despite insufficient voltage.
Solution Approach 2:
The system changes the physical parameter of intake manifold pressure dynamically based on battery voltage conditions. When voltage is detected to be low, the control apparatus adjusts the intake manifold pressure to a lower value, thereby changing the operating conditions to favor successful engine restart under constrained energy availability.
2Power
If the starter motor is used to restart the engine, then engine operation is restored, but the available torque is insufficient to overcome engine friction and rotational resistance due to low battery voltage
Solution Approach 1:
The control apparatus changes the intake manifold pressure parameter to reduce the mechanical resistance during engine cranking. By lowering the intake manifold pressure when battery voltage is insufficient, the compression resistance and rotational load on the starter motor are reduced, enabling the limited torque to overcome the reduced resistance and successfully start the engine.
Data Source
AI summary
A vehicle includes an engine, an intake manifold, a starter motor, a battery, and a control apparatus. The intake manifold is coupled to the engine. The starter motor is configured to start up the engine. The battery is configured to drive the starter motor. The control apparatus includes one or more processors, and one or more memories coupled to the one or more processors. The one or more processors are configured to execute idle reduction control, and execute, during execution of the idle reduction control and before cancelling the idle reduction control, adjustment control of adjusting an internal pressure of the intake manifold and causing the internal pressure of the intake manifold to be lower as a voltage of the battery is lower.